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单项选择题

A.It is a big problem in the management of the city.
B.It is a push needed to develop the city.
C.It is a cause of disintegration of the city's social structure.
D.It is an obstacle to the development of the city.

    A.It
    B.
    B.It
    C.
    C.It
    D.
    D.It
    E.
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